var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var fs=require("fs");
var path=require("path");
var fpath=path.join(__dirname,"db.json");

//这个库的方法可以将有回调函数的方法转变成promise对象
var {promisify}=require("util");
var writeFile=promisify(fs.writeFile);



var app = express();
//获取数据对象
var db=require("./db.json");



// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.get("/jquery_ajax_load",function (req,res){
  res.send(`
    <h1>我永远都会是我</h1>
    <p>你呢</p>
    `);
});

app.get("/init",function (req,res){
  res.send(db);
});

app.post("/up",function (req,res){
      db.push(req.body);
      writeFile(fpath,JSON.stringify(db));
      res.send();
})

app.post("/jquery_ajax_post",function (req,res){
  res.send({name:"qiqihaer",tel:"123456789",qh:req.body.qinghua});
});

app.get("/jquery_ajax_get",function (req,res){
  res.send(req.query);
});
// catch 404 and forward to error handler
app.use(function(req, res, next) {
  next(createError(404));
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

module.exports = app;
